CH 12 Forces

3. the first one to suggest that gravity is universal and affects all objects in the universe; SI unit for force (N)
5. acts on objects when they are rolling over a surface
6. a measure that has both size and direction; can be represented by an arrow
7. acts on objects when they are sliding over a surface
8. measures the force of gravity pulling downward on an object; SI unit is the Newton (N)
11. acts on objects that are moving through a fluid (liquid or gas)
12. the combination of all the individual forces acting on an object

1. movement of an object in a curved path toward the ground because it has both a horizontal force and the downward force of gravity acting on it
2. acts on objects when they are resting on a surface
4. a force of attraction between things that have mass; on Earth the force that pulls objects down toward the ground
9. a force that opposes motion between any surfaces that are touching
10. a push or pull acting on an object; gravity, friction, and applied force